Answer:
We applaud if you perform well.
You get embarrassed when you stand on me when everybody is watching. Women don't like to talk about the number they see on me. Everyone stands on me when nobody is around
Teenage girls are pros at creating me. Learn me in classes.
I am long and slim works in light. Has but one eye and an awful bite.
Glittering points that downward thrust. Sparkling spears that never rust.
What never gets any wetter no matter how hard it rains?